Bag



A. POTDEVIN March 6, 1934.

BAG

Filed June 9, 1931 2 Sheets-Sheet l IN VEN TOR. 4 4 mu;

BY gwf'd a MW A TTORNEYS.

March 6, 1934. A. POTDEVIN 1,949,622

BAG

2 Sheets-Sheet 2 Filed June 9, 1931 INVEN TOR. 44%.: m BY M A TTORNEYS?I Patented Mar. 6, 1934 BAG' Adolphl'otdevin, Garden City, N. Y.,assignor to Potdevin Machine Company, Brooklyn, N. Y., a. corporation ofNew York Application June 9, 1931, Serial No. 543,086

2 Claims.

My invention is directed to an improvement in bags of the muti-wallvalve type such as are employed for cement, for instance, in which thebags are closed at both ends and then filled through a so-called valveinstead of through an open end of the bag.

'One of the objects of my invention :'s the provision of a bag of theclass indicated in which the paper webs constituting the bag walls arecut in a novel manner or shingled so that when they are folded over andpasted the bag will be of increased strength at all seams and at itsends as well as being leak-proof. This is of importance when the bagsare to be used for heavy materials such as cement, for example, wh ch isin the form of a dry powder and unless the bag is construc ed in suchfashion that the various overlapping portions of the bag are strong andwell pasted together leakage will occur.

:0 A further object of my invention is the provision of a bag of theclass indicated wherein the valve end is of minimum thickness andmaximum fiex'bility whereby filling of the bag through the valve isfacilitated. 1

A still further object of my invention resides in the manner of cuttingoff the bag lengths so that one end of the bag will be complementary tothe other whereby paper waste is entirely eliminated.

In the drawings accompanying myapplication;

Fig. 1 is a tube secton cut from the bag material;

Fig.2 is a transverse section through Fig. 1;

Fig. 3 is a plan view of the valve end of the tube after the firstfolding operation and after adhesive has been applied;

Fig. 4 is a view showing the next step in the folding operation;

Fig. 5 shows the valve end of the tube after the folding operation andsealing have been completed;

Fig. 6 is a transverse sectional view taken through the folded or valveend of the tube;

Fig. 7 is a longitudinal sectional view through the bag showing bothends folded and sealed;

Fig. 8 is a view simlar to Fig. 1 showing a modified form of myinvention;

Fig. 9 is a view showing the first step in the folding operation of thebottom of said modified form after the adhesive has been applied;

Fig. 10 is a view of the top or valve end of the modfied form showingthe first step in the fold ing and sealing operation;

Fig. 11 is a view showing the final sealing operation of the valve end;

Fig. 12 is a view similar to Figs. 1 and 7 showing another form of myinvention;

Fig. 13 is a vLew showing a step in the folding and sealing operation ofthe bag of Fig. 12; and

Fig. 14 is a longitudinal sectional view of one end of the bag of Fig.13.

It is to be appreciated that the invention of this application relatesto a continuous operation in that the paper is fed into a machine,formed into a tube, the tube severed into bag lengths and 05 each endfolded in or bottomed to complete the bag in a manner to be hereinafterdescribed.

Referring to the drawings in detail and first of all to Figs. 1 to 7,inclusive, wherein I have shown a two-ply bag for convenience ofillustration, it being understood that any desired number 'of plies maybe employed. The outer tube or ply is designated 1, while the inner tubeor ply has been designated 2. For clarity of description the upper andlower walls" of tube 1 have 15 been designated 3 and 4, respectively,and the upper and lower walls of tube 2, 5 and 6, respectively.

As the multi-wall tube is advanced continuously the same is severed atintervals to provide sucgo cessive bag lengths. In this severingoperation the inner tube 2 is severed straight across for its entirewidth to provide an even or unbroken edge 8 on wall 5 and the same typeof edge 9 on wall 6, while the outer tube 1 is severed to pro- 35 vide aflap 10 on the lower wall 4 and a recess or cutout portion 11 in theupper wall 3. In forming the end of the bag, as above described, it willbe appreciated that a recess is provided in the opposing end of thesucceeding section of the 9 outer tube 1 corresponding to the flap 10and a flap on the opposite wall of the same tube corresponding to therecess 11. Opposite ends of any bag length, therefore, are complementaryas will be understood. For instance, referring to Fig. 1, it will beseen that the opposite end of the bag from that just referred to will beprovided with a flap 12 corresponding to the cutout 11 and with a recessor cutout 13 corresponding to the flap 10.

I wish to emphasize at this point that the manner or mode of cutting thepaper so as to form the ends of the bag eliminates paper waste and inaddition provides a construction in which thorough pasting of the bagends is assured as will be brought out hereinafter. This method ofcutting or forming the ends of the bag lengths also reduces thethickness of the ends of the bag as compared with prior structures. Theelimination of paper waste will of course eliminate the necessity of theprovision of means for freeing the 1m machine of waste paper and theadvantage of this will be appreciated if it be borne in mind that thepaper in actual practice passes through the bag making machine as acontinuous tube and at high speed.

After the tube has been cut off as above described the valve end thereofis opened up, the side 14 and valve portion 15 folded in diagonally andthe upper wall of the tube folded back upon itself, as illustrated inFig. 3. The side portion 14 is then coated with adhesive as shown at 16,adhesive also being applied to the face of the lower wall 6 of the innertube 2 and the face of the tab 10 on the lower wall 4 of the outertube 1. The folded back portion of the tube is then folded forward, asviewed in Fig. 3, along the broken line 17, as shown in Fig. 4, over thepaste 16. The tube is then folded from the position shown in Fig. 4 tothe position shown in Fig. 5 along the broken line 18 to bring theposted portion of the wall 6 upon the unpasted portion of the wall 5 ofthe same tube in the recess or cutout 11, and this same part of theinner tube contact? ing with the upper face 3 of the outer tube 1, sothat the lower wall 6 of the inner tube will be sealed to the upper wallof the same tube as well as to the upper wall of the outer tube. In thissame continuous operation the flap 10 is brought over into superimposedrelation with the upper wall 3 of the outer tube 1 so that we have theend of this tube folded over and sealed down, as illustrated in Fig. 5.

It will be understood that the opposite end of the bag is similarlybottomed except that both turned in portions or corners are pasted andsealed, instead of leaving one unpasted portion such as 15 for a valve.

It will be seen, therefore, that my construction provides a bag in whichone wall of the inner tube is pasted or glued directly to the oppositewall of the same tube as well as to the opposite wall of the outer tubeand that one wall of the outer tube is pasted or glued to the oppositewall of the outer tube, thereby insuring a thorough sealing of the bagend to prevent leakage and also preventing, due to the shingled effectproduced in the cutting off operation or forming of the bag end, a muchmore flexible end than provided in valve bags as heretofore constructedand wherein the shingled effect is not employed.

Referring to the embodiment of my invention illustrated in Figs. 8, 9,10 and 11, the tubing from which the bags are to be formed is cut in amanner similar to that described in connection with Fig.1 except in thatthe lower wall 6 of the inner tube 2 instead of being cut straightacross, as in the case of Fig. 1, is provided with a tab 19, while allfour walls of the tube are cut 'or slit longitudinally as indicated at20 a 21 so that in the bottoming of the bags tag side portions 22 and 23at one end of the bag,v Fig. 9, and valve portions 14 and side portions15 at the other end -of the bag, Fig. 10, can be folded in a greaterdistance or depth than with the construction of the bag above described,to provide an increase in the pasting area, as will be appreciated bycomparison, for example, of Fig. 3 with Figs. 9, 10 and 13. In all otherrespects the bag of Figs. 8 to 11 is the same as the bag of Figs. 1 to'l.

The bag of Figs. 12, 13 and 14 is the same as the bag of Figs. 8 to 11except that the bag of Figs. 12 to 14 comprises three plies, 24, 25 and26, instead of the two plies of Figs. 8 to 11, the two plies 24 and 25of this last form of my invention each being provided with a tab 19',corresponding to the tab 19 of Fig. 8.

I wish it to be understood that the number of plies or thicknessesillustratedandabove described is not to be taken as limiting the scopeof my invention, my invention comprehending the use of any number ofplies that may be desired but in all cases the overlapping portions orthose portions which I have referred to as tabs herein will be cut instep formation, as above described.

It is to be understood also that my invention comprehends employingplies not only of the single thickness which have been illustratedherein but of several thicknesses when desired.

What I claim is:--

1. As an article of manufacture a bag length the walls of which aremulti-ply, the plies constituting each wall of the bag length beingshingled at each end of the bag length, the shingled formation at oneend of the bag length being complementary to the shingled formation atthe opposite end of the bag length, the shingled plies of one wall ofthe bag length extending beyond the shingled plies of the other wall ofthe bag length at the same end of the bag length.

2. As an article of manufacture a bag the walls of which are multiply,the plies constituting one wall of the bag being shingled intermediateits sides at one end of the bag, the plies in the op-- posite wall ofthe bag at the same end of the bag being shingled intermediate itssides, and extending beyond the end of the first mentioned wall, bothwalls of the tube being slitted lengthwise along the sides of theshingling, the opposite corners of both walls of the shingled end of thetube being inturnedalong said slits, and the shingled portion of thelonger wall of the tube being folded over to overlap the shingling ofthe shorter wall to which it is sealed.

ADOLPH POTDEVIN,

